Linebacker Lawrence Timmons' interception and Shaun Suisham's 23-yard field goal in overtime powered the Pittsburgh Steelers to a 16-13 win over the Kansas City Chiefs in Monday Night Football at Heinz Field.

Timmons intercepted Matt Cassel's first pass in overtime and returned it 23 yards, paving the way for Suisham's game-winning goal that improved the Steelers' mark to 6-3 and their Monday Night Football home record to 24-5.

However, the Steelers' fourth straight win proved costly as they lost star quarterback Ben Roethlisberger to a right shoulder injury in the third quarter.

Roethlisberger landed on his throwing shoulder after being sacked by Chiefs pass rushers Tamba Hali and Justin Houston.

"It was the end of a possession, he came off the field, at some point in the next possession when the defense was on the field I got information that he was being evaluated and that's all I know regarding it," said Pittsburgh coach Mike Tomlin.

Roethlisberger was brought to a local hospital and underwent an MRI but the extent of the injury will not be known until Tuesday. NFL.com reported that the initial diagnosis on the quarterback is a sprained right shoulder.

Before the injury, Roethlisberger had completed nine of 18 passes for 84 yards and a touchdown.

Backup quarterback Byron Leftwich took over, hitting seven of 14 passes for 73 yards while Suisham buried three field goals for the Steelers.

"He's been rock solid for us. Not only tonight, but all season, regardless of circumstance or conditions. We respect him. He's a critical part of our football team," Tomlin said of his kicker.

Cassel finished 11-for-26 for 154 yards and an interception while running back Jamaal Charles tallied 100 yards on 23 carries and a touchdown for the Chiefs (1-8), who lost their sixth straight game.

Charles opened the game with a 12-yard run and Ryan Succop added a 22-yard field goal to give the Chiefs a 10-0 lead in the second quarter.

Suisham answered with a 35-yard field goal and Roethlisberger found Mike Wallace for a seven-yard scoring strike to tie the count at the break.

Suisham put the Steelers ahead in the fourth period with a 31-yard field goal but Succop buried a 46-yard kick as time ran out to force overtime.